ACSD-55031: Type "mixed" cannot be nullable error during compilation

The ACSD-55031 patch fixes the issue where the Type "mixed" cannot be nullable error during compilation after installing a custom extension. This patch is available when the Quality Patches Tool (QPT) 1.1.40 is installed. The patch ID is ACSD-55031. Please note that the issue was fixed in Adobe Commerce 2.4.6.

Affected products and versions

The patch is created for Adobe Commerce version:

• Adobe Commerce (all deployment methods) 2.4.5-p4

Compatible with Adobe Commerce versions:

• Adobe Commerce (all deployment methods) 2.4.5 - 2.4.5-p5

Issue

The Type "mixed" cannot be nullable error occurs during compilation.

Steps to reproduce:

1. Install a custom extension.
2. Run the command bin/magento setup:di:compile.

Expected results:

No errors occur during compilation.

Actual results:

The var/log/system.log file contains the error:

report.ERROR: Type "mixed" cannot be nullable

Apply the patch

To apply individual patches, use the following links depending on your deployment method:

• Adobe Commerce or Magento Open Source on-premises: Quality Patches Tool > Usage in the Quality Patches Tool guide.
• Adobe Commerce on cloud infrastructure: Upgrades and Patches > Apply Patches in the Commerce on Cloud Infrastructure guide.

Related reading

To learn more about Quality Patches Tool, refer to:

• Quality Patches Tool released: a new tool to self-serve quality patches in our support knowledge base.
• Check if patch is available for your Adobe Commerce issue using Quality Patches Tool in our support knowledge base.

For info about other patches available in QPT, refer to Quality Patches Tool: Search for patches in the Quality Patches Tool guide.